Gree U-MATCH Series Service Manual page 96

 P6 Drive-to-main-control communication error
 Lc Compressor Startup Failure
 P5 Compressor current protection
 H7 Compressor motor desynchronizing
 H5 IPM protection
 Ld Phase loss
Lc is displayed on
the wired controller
Lc is displayed in
the mainboard 88
indicating lamp
Replace the
Yes
mainboard. Does it
work normally?
Replace the
compressor
Work normally
P5, H7, H5 or Ld is displayed
on the wired controller
P5, H7, H5 or Ld is displayed
in the mainboard 88
indicating lamp
No
Is the compressor
phase sequence right?
Yes
Yes
Is the compressor wire
terminals tightened？
No
Replace the mainboard.
Does it work normally？
No
Replace the compressor
93
U-Match Series DC Inverter Service Manual
No
adjust the
compressor
phase sequence
Tighten the
compressor wire
terminals
Yes
Work normally